A Rare Case of Alternaria citri Keratitis Successfully Treated with Voriconazole

The genus Alternaria comprises several species of dematiaceous hyphomycetes known to cause opportunistic infections in humans. Over the past two decades, fungal infections have emerged as a significant cause of morbidity and mortality, particularly among immunocompromised individuals. Such infections often occur following disruption of the skin or corneal epithelial barrier, especially in patients with pre-existing ocular conditions or compromised immune status. This case report describes a rare instance of fungal keratitis (FK) caused by Alternaria citri in a 71-year-old male who presented with an acute onset of eye infection. The patient showed a favorable response to treatment with voriconazole.